Boxing for drills.



A. WALKER.

BOXING FOR DRILLS.

.APPUCATION FILED NOV-7. 1911.

1 273,96 1 Patented July 30, 1918.

2 SHEETS-SHEET I.

A. WALKER.

BOXING FOR DRILLS.

APPLICATION FILED NOV-7| 19H.

1 373,96 1. Patented July 30, 1918.

I 2 SHEETS-SHEET Z.

cb. d

ALEXANDER WALKER, QF CHEER, IOWA.

I BOXING r011, Dams, 7

Sp c i f e t r t Iatent'ed; July 30,1918.

Application fi1ed=N-ovember 7-, 1917. Serial No..200,810.

To all whom it may concern: a

Be it known that I, ALEXANDER WALKER, a citizen of the United States, residing at What Cheer, in the county of Keokuk and State of Iowa, have invented certain new and useful. Improvements in Boxings for Drills, of which the following is a specification.

This inventionarelates to boxing'for drills and has special reference to the means whereby the sections of the boxing are fas- The invention is illustrated in the accompanyingdrawings 'and' will be hereinafter fully described,fthe novel features being subsequently particularly pointed out.

In the drawings:

Figurel is a perspective view of a side gear boxing having my invention applied thereto;

Fig. 2 is an end view of the same;

Fig. 3 is a section on the line 3-3 of Fig. 2 showing the parts in the locked position;

Fig. 4 is'a similar View showing the parts in the released position; i

Fig. 5 is a detail perspective view ofthe locking lever; I

Fig. '6 is an end view of an end gear boxing having the invention applied thereto;

Fig. 7 is a section on the line 77 of Fig. 6;

Fig. 8 is a plan view of the arrangement illustrated in Fig. 6.

The boxing consists of two substantially semi-cylindrical members 1 and2 which are internallythreaded, as shown, at 3, to engage the thread'bar ofthe drill and arehingedly or pivotally connected atone side by-a pin 7 or similar device 4; In-the form of boxing shown in Figs. 1 to 5, trunnions 5-are provided at one end of the section 2 of the boxing to engage notches in a drill supporting post, and at the opposite end ofth'e boxing, supporting devices 6 for the-drill-pperating gearing are provided Upon the lowersecti'on 2; atthe free edge of the same an'dipreferablymidway its ends, I form a fulcrum pin 7*at' the base of whichis a substantially semi-circular enlargement 8 having its upper edge beveled, as shown at 9, whereby the outer face 10 of the said enlargement will extend slightly above the.

inner face, thereof or the juncture of .the

The obj ectof the same with thesurface of the section 2, of the boxing.

The peripheral edge of-tl1eenlarge1-nent 8 is provided belowthe pin 7; witha shoulder 11- whichextends; longitudinally with respect to the said pin and the upper beveled; edge of the enlargement extends.- in a, straight line transversely with respect to the pin and longitudinally with respect tothesection 2 of the boxing, ascle arly shownin Fig 3. The section 1v of the-boxing isprovided wv-i th a 'projectionor lug 12, the lower edge-13 of which is beveled. to. rest upon the beveled edgei) ofthe enlargement Sand-this beveled edgealso extends transversely withgrespect to the pin 7 andlongitudinally with respect tog'the section lsothat an intimate contact between-these two beveled faces may be ob.-

tained. The lug or. projection 12; has its outer peripheral surface flared outwardly from the surface of the section 1 of the. boxing, as shown most clearly in Fig. 2, and. itwill be noted'upon reference to said figure that the outer planefaces of theenlargement 8 and the lug orprojecti0n12 are inclined relative to the vertical planeof the boxing. Adjacent theenlargement 8, I'loosely mount upon .the fulcrum pin .7 a camor, looking lever 14 whichha s itsupper portion shaped to be easily grippedorhandledby theoperator and has its lower portion in, the form of a ring 15 encircling the fulcrum pin and. having its inner face 16 inclined. to; rest;

against the outerinclined face of the .enlargement 8 and the projection 12, theouter face of the ring like body 15 being disposed at aright angle tothe. axis ofthepin 7 and adapted to'bear against a'retainingwasher 17 which is 'secureduponthe said pinby a retaining pin a 18 V inserted throughthe wash-- er and the fulcrum. The operating lever is constructed with a: rib 19 projecting. from the inclined. face 16 and having-an eccentric inner surface 20 adaptedrto ride -o.'ver:the

upper peripheral surface of the lug; 12 and thereby force the lug against: the projection or enlargement 8 so asto positivelydockthe. sections of the boxing together,"-and' it will be readily "noted that the-rib '19. with its surface 20 overhangs the lug 12 so that as 1 the lever is turnedto the locking position shown in-Figs. 2 and 3 it willbindb'etween; thewasher and thefouter facesof the: lug.12 andenlargement 8 andtend to draw thelug 1 and enlargement longitudinally of thekful- I crum 'F aswell as force them together. across the saidfulcrum. The parts will thus be y caused to bind together with sufficient holding force to withstand all ordinary usage and remain closed under accidental blows. Upon reference to Figs. 1 and 3 it will be noted that in order to lock the sections together the miner or other user of the drill will move theupper end of the locking lever toward himself and is, therefore, not required to perform any unnatural or laborious movement in looking the boxing. To release the boxing the upper end of the lever is merely pushed forward, as shown in Fig. 4, and to limit this forward movement a stop shoulder 21 is provided at the end of the rib 19 to engage against the shoulder 11 on the enlargement 8 so that the locking lever is not given a very lengthy movement either to lock or unlock the boxing and when in unlocked position it will be supported so that it may be easily and readily reached by the miner and quickly brought to the locking position.

In the form of the invention shown in Figs. 6, 7 and 8, the trunnions 25 are provided generally at points midway the ends of the respective boxing sections 26 and 27 which are hinged together at one side by a pin 28 inserted through coacting lugs or cars formed on the sections at the end of one of the trunnions. The trunnion projecting from the free edge of the lower section 27 is in this instance utilized as the fulcrum for the locking lever 29, an enlarge ment 30 being formed around the base of said trunnion and having a stop shoulder 31 and an upper beveled or inclined surface 32 corresponding to similar elements in the previously described form. The upper section 26 is provided With a projection 33 adapted to project over the enlargement 30 and having an under inclined face 3i adapted to rest upon the inclined face 32 of said enlargement. The locking lever is mounted upon the fulcrum 25 and its outer face is inclined-in one direction so as to have a wedging binding action upon the retaining washer 35 which is held upon the trunnion 25 by a fastening pin 36. The lever is provided on its inner face with an overhanging rib 37 having an eccentric inner surface 38 and terminating in a shoulder 39 adapted to bear against the stop shoulder 31. The inner peripheral face of the rib 37 in this form of the invention extends parallel to the longitudinal axis of the trunnion and the upper surface of the lug also extends parallel to said axis, the desired binding action being obtained by the inclined coacting faces of the lever and the washer35. The manipulation of the lever is the same in every respect as the action of the lever in the previously describedform.

In Figs. 1 and 2 is shown a flat-sided lug Copies of this patent may be obtained for Having thus described the invention, what is claimed as new is:

1. The combination of boxing sect-ions provided with coacting projections, a fulcrum projecting from the lower section concentric with the projection thereon, and a locking lever rotatably mounted upon said fulcrum adapted to bear eccentrically upon the projection on the upper boxing section, the locking lever and the projection on the lower boxing section having: coacting stop shoulders whereby to limit the releasing movement of the lever.

2. The combination of boxing sections having projections at their free edges provided with coacting inclined faces, a fulcrum projecting from one of the sections, and a locking lever rotatably mountedupon said fulcrum and having an overhanging rim extending partly around the projections on the boxing sections and an eccentric inner face to engage one of said projections and bind them together.

3. The combination of boxing sections, projections on the free edges of said sections adapted to abut when the sections are closed, a fulcrum extending from one of said projections, a locking lever rotatably mounted upon said fulcrum and having its inner face bearing against the projection at the base of the fulcrum and constructed with an overhanging eccentric rib adapted to bind upon the outer surface of the other projection, and means for retaining the locking lever upon the fulcrum.

4. The combination of boxing sections, a fulcrum projecting from one of the sections at the free edge thereof, an enlargement around the base of said fulcrum, a lug on the other boxingsection adapted to bear upon said enlargement, a retaining washer secured upon the fulcrum, and a locking lever rotatably fitted upon the fulcrum between said washer and the enlargement at the base of the fulcrum, said lever having an overhanging eccentric rib adapted to bear upon the lug coacting with said enlargement, and one facevof said. lcver being disposed obliquely withrespect to-the longitudinal axis of the fulcrum.

In testimony whereof I affix my signature.

ALEXANDER WVALKER. [1,. s]

five cents each, by addressing the "commences of Patents, Washington, D. G. 

